 is the dwarf planet Pluto, which has a satellite called Charon, spelled C-H-A-R-O-N. It also has the same phenomenon, where you don't see the other side, because as this, this is probably best demonstrated if you were in a planetarium environment, where you could see the motions of how these things happen. So yes, there's just more than one, and probably many more out there in the great universe.